The diameter of a circle is 8ml. what is the circles radius?

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

In the diagram of circle o, what is the measure of zabc?